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c++ - [Bug?:] Bad error message?

I'm getting the error report:
H:\STLSoft\Identities\STLSoft\stlsoft\comstl_bad_interface_cast.h(151) : Error:
return type of overriding function 'std::bad_cast::what' differs from that of
'stlsoft::comstl_project::bad_interface_cast::what'
It was declared as: char const *member func()const
It is now declared: char const *member func()const
Standard library is HP/SGI
--- errorlevel 1
and I can only presume that the compiler is detecting differences in exception
specifications. So, my questions are:
1. Does DMC++ detect / discriminate between overloads based on exception
specifications
2. If so, can we have an error message that makes that clear?
Cheers
Matthew